PP-1104B/G Power Supply used as battery charger


After getting tired of Walmart style "smart battery chargers", which were not very smart and did not charge things well, I changed my mind and decided to follow advice of rec.crafts.metalworking members who suggested to use a big old iron type power supply.

I bought this PP-1104B/G, in a lot with PP-1104C/G. PP-1104B/G is very similar to PP-1104C/G, with differences being purely cosmetic.

I tried using one to charge my deep cycle batteries. I noticed right away that it has a very annoying quirk. When powered off, if connected to a battery, it exhibited "reverse current", with the battery quickly drained through the power supply. I think that it is due to the supply having a big capacitor bank and a beefy discharge resistor -- so that the battery would discharge itself through that resistor.

That problem was solved by adding a diode to the output so that DC current can only flow one way. Problem was solved. (see pictures)

I also added clamps, and casters to this power supply so that it can be easily moved.

I will also buy and install a Intermatic timer to it so that I can limit the amount of time that the charger runs before shutoff. I will buy one that has a hold capability in addition to timer capability.

(Click on the thumbnail images to enlarge)

Adobe PDF Document Document: Linear-Voltage-Regulators-NatSemi.pdf
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Adobe PDF Document Document: PP-1104C_G-Power-Supply-1.pdf

Adobe PDF Document Document: PP-1104C_G-Power-Supply.pdf